Metallic-filament lamp.



H. J. JAEGER.

METALLIC FILAMBNT LAMP.

APPLICATION FILED JAN.27,1914.

Patented Deo. 15,1914.

un 2. u .w It un mw entrain sacarse learner o i HERMAN J. JAEGER, orwnnnnwnnn, New JnnsnY.

METALLIC-rumana' LAMP.

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To all whom it may concern Be it known that I, HERMANJ. J AEGER, a citizen of the United States of America, and a resident of l/Veehawken, county of Hudson, State of New Jersey, have invented ce1'- tain new and useful improvements in Memilio-Filament Lamps, of which the following is a specification.

This invention has reference to improvements in metallic filament lamps. It pertains particularly to lamps of this type which embody both a high and a low candle power filament. These two larnents are ar.

ranged on three leading in wires or leads in a peculiar manner. While the high candle power filament is arranged in the usual manner on an outer and a central lead, the low candle power filament, which preferably isl a so-called concentrated filament, is arranged on a shorter, third lead below the high candle power filament and its top end is connected to a small low resistance but conductive strip which in turn is-connected to the middle lead. long leads for the high candle power filament as well as the short lead for the con- Centrated low candle power iilament, are

ne tubes which are fused `to the short platinum wires that are located in the solidglass portion of the supporting stem. These lamps may be made for any` use but are particularly designed for use in automobiles as headlights. Accordingly, both filaments are low voltage filaments, as required for automobile lamps.

VVhen the automobile is running the head light should be as powerful as possible, therefore, the high candle power filament 1s thrown into the circuit, but when the automobile stops at the point of destination some light is required and as the big headlights consume too much current the low candle power filament is thrown into the circuit whereby current is saved.

The leads are secured to the base in a suitable manner which base is placed into a socket having corresponding contacts. All the novel features are inclosed in the globe, therefore, the lamps present the usual appearance.

n order to render the invention entirely clear, reference is had to the accompanying drawing in which:

Figure l represents in side elevation, partly broken away, an automobile lamp which embodies in desirable form the pres- Specification of Letters Patent.

All the leads, the two ent improvements. Fig. 2,shows on an en- Patented Dec. i5, 191415., .Application flied January 27, 191.4.V Serial No. 814,618. l .i

vSimilar characters of reference denote like parts in all the figures.

In the drawing a represents the globe, Z) is the stem or support. The leads c, Z and e pass through the stem parallel to each other. Each lead connects lwith a short platinum wirecln (Z1, el in the usual manner. The

other ends of the. platinum wires are connected each to a fine conductive tube. The

. platinum wire c1 connects with a fine tube f,

the wire d1 with a like tube g, and the wire Vel with a similar but considerably shorter -tube It. The lower portions of these line tubes accordingly are fused into the solid.`

portion of the stem or support, as shown in F ig. l. The high candle power filament may be of any desired form according to the use for which the lamp is intended. In the automobile lamp illustrated a` conical filament z' is shown having one straight end portion 1 which passes through the center of the lament and is attached to the tube g ofA the central lead Athat connects with the so called ground wire. The second end 2 of the coiled filament 'L' extends over to the tube 7' and is attached thereto and thus is in connection with the lead 0. VThe central tube g further carries a short conductor which preferably is flat and extends horizontally and then downwardly for a short distance. A small hole j? referably is provided in the short downward portion of this horizontal conductor for the purpose of securing therein a short concentrated filament c, which represents the low candle power filament.

The width of the branch conductor j is so selected that the concentrated low candle power filament /c is about at equal distance from the tube g, as said tube is from the tube f. Accordingly, the lower end of the small filament 7c is easily connected to the short tube 71. which in turn forms the top part of the lead e.

In Fig. 2 of the drawing the fine terminal tubes f and g are shown on an enlarged scale. The tube g is'provided at the top with the horizontal branch conductor j previously mentioned, and the concentrated low candle power filament is shown to be connected to said branch conductor. The ends z'l, 112 of the high candle power filament ure connected to the tine terininul tubes f and g. The central end iportion lA ot' the high candle power filament e' extends through the entire length of the fine tube g and is secured therein by pressing the top portion of the tube g together so as to be in. goed conductive Contact therewith. Likewise, the end portion of the high candle power lilninent t' extends through the fine tube 7" und is secured thereto in a. similer manner. This insures zi, long perfect Contact between the ends of the hi gli candle p wer filament and the tine terminal tubes of the leads.

The neel; al o the lamp is surrounded by n base Z and the lead c connects with e oontact point m., the central lead or ground wire with a Contact point n on the metallic bese While the lead e connects With u contact point o. The Contact point n is preferably in the top portion of the base While thev tiro contacts m, 0 are at the bottom o the base insulated from each other and from the base in the usual manner. y

The socket employed with this leinp lhas' corresponding Contact points which render it possible to place the high candle power lninent into the circuit and also the' low candle power ilunient, :is required in practice. The two i'iluinents for the usual automobile lamp are preferably inude of tungsten and in many instances require about sixl volts.

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tending;- beyond suine, ii l'iiglicundle power.

ilannent connected to two of the seid lends, and e low candle power lila-nient connected to the third lead and one of the leads of the high' candle power filament.

2. A metallic lament lenip consisting of.;

lead carried by said stein and forming fine' tubes et the top extending beyond the stein, e conical high candle power metallic tilenient connected to two voit said line tubes, a,

horizontal conductor connected to the top oi the centra-l iine tube, an adjoining` third lead with a short line tube extending but -slightly beyond the stein, und a. straight coneentrated'ilament secured to sei-d short line tub .v :ind'to said horizontal conductor.

4;. In a metallic filament lump, n. stein tov with leeds forming fine terminal tubes et the top ends paitlyfused into the stein vand extending beyond suine, and ai. filament' reaching); down to the bottoni having ends tubes, said fine tubes being of the tine pressed with of January, 1914. I

I HERMAN J. JAEGER.

l/Vtnesses:

MARIE R. LEAHY, ELrzABE'rH KRAMER.

their top portions to the ilanient ends to forni perfect contacts.

Signed at New York, N. Y., this 26th day' Jing im 

